This is the best mouse I've ever used
I used to have Gigabyte GM-M8000 followed by Logitech G500
the Gigabyte was really awesome but then suddenly my friend stole it from me lol and Gave me his G500
the G500 was great too but a little heavy for me
then I got this which has a light feeling in my hand fits my hybrid grip greatly

Pros:
has a feature I really liked which is FREEMOVE that reduced sudden pointer twitch when you get shocked by an enemy soldier being so close to you and madly fire at him lol

smooth, accurate movement you can feel it as part of your hand (seriously )
fits left handed people
nice shiny look thought it's a dust magnet

I put ambidextrous at cons because the right mouse buttons can be easily pressed while gaming.I had to disable mine.The sensor acceleration became a pain in the a**.It can be frustrating even at web surfing.I tried every "mouse fix" out there but the sensor acceleration can't be turned off or lowered.It has acceleration even on a hard pad (Razer Destructor) at low DPI (450,630,720,810 etc.) .A gaming mouse shouldn't have acceleration at all.Don't be fooled by the "professional gamers" that are advertising this.They are paid to do it.So,before you buy this I suggest that you go and try it at a friend or a store/showroom.

Based off the critically acclaimed Xai gaming mouse, the SteelSeries Sensei is a top of the line laser gaming mousededicated to suiting tournament level players. It features a highly sophisticated firmware that allows for multipleadjustments of the sensor functionality, as well as complex macros to customize the mouse to the user’s specificdesires. With the SteelSeries Engine and illumination present on the design, the Sensei has a new look, both on theoutside and on the inside. At the same time though, the Sensei still retains all the features that the original Xai is knownfor such as its ambidextrous design, the ability to save different profiles on board, and the LED panel to customize themouse on the fly.